Without the boosters installed. I can put those back in if that would help. There is no binding or grit until I put them in, but I cannot see any evidence of the spring rubbing the inside of the lower.

So talked myself into one of these $200+ units because my last trigger wasn’t 100%. I’m having issues. Not sure if trigger is out of spec, lower is out of spec, or if I’m doing something wrong....
When I install the trigger and hammer, I get a decent 4# trigger. However when I install either of the spring sets on the fork, it goes to 8# and super gritty. It feels like something is rubbing once I put the extra tension in it with the springs.
Kind if frustrated as I ruined my ambi safety getting it out to even install this unit. $200 trigger I can’t use and a $70 jp safety I had to remove with a cut wheel. Pretty epic weekend of making my gun “better”.

the mag catch is the same shape on both sides (after installing the button) and the mags have notches in both sides. Essentially works the same way a glock mag release flips, to my knowledge. I never swapped mine around.